EMISSION CONTROLS AND FUEL SYSTEM 165
MAIN BODY
Exploded view
of Holley 4150
C.E.C. VALVE ADJUSTMENT
1971 4150 Holley
This adjustment is made only when it has
been necessary to remove the throttle plate,
overhaul the carburetor, or replace the sole-
noid. To adjust, warm the engine and place
the transmission in Neutral for manual trans-
missions or Drive for automatic transmis-
sions. If so equipped, turn off the air condi-
tioner. Disconnect the vapor-canister fuel
tank hose and remove and plug the distribu-
tor vacuum hose. Extend the C.E.C. valve
plunger until it touches the throttle lever and
then adjust its length until the specified idle
speed is reached.
DISASSEMBLY AND ASSEMBLY
Disassembly and assembly are similar for the
4150 and 4160 series carburetors although
there are minor differences from model to
model. The following is a generalized disas-
sembly and assembly procedure for all Cor-
vette, four-barrel Holley carburetors.
1. Remove the primary and secondary
fuel bowls, metering bodies, plates, splash
shields, and fuel tubes.
2. Disconnect the secondary throttle-op
erating rod from the throttle lever. Remove
the secondary throttle-operating assembly and
gasket from the main body of the carburetor.
3. Remove the float hinge pin retainer
and remove the float and spring from the
bowl. If so equipped, remove the inlet baffle.
4. Loosen the inlet needle and seat lock
screw and remove the assembly. Remove the
sight plug and gasket.
5. Remove the inlet fitting(s), gaskets, fuel
filter, and spring.
6. On the primary bowl: remove the air
vent assembly (except early 4150); remove the
pump diaphragm screws and lift the pump
housing, diaphragm, and spring from the fuel
bowl; check that the pump inlet ball can move
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Exploded view of Holley 4150 bowl
